diff --git a/[refs] b/[refs]
index b98aa57f3b24..a8ccb74ec122 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e7db38c38fe8df1d890ae772737e27308bdc5956
+refs/heads/master: 91b2a3f9bb0fa8d64b365a10b0624b0341e1a338
diff --git a/trunk/net/ipv6/sit.c b/trunk/net/ipv6/sit.c
index 193d0c6c5ce2..510d31f3cb96 100644
--- a/trunk/net/ipv6/sit.c
+++ b/trunk/net/ipv6/sit.c
@@ -1014,9 +1014,12 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 					 ip6rd.prefixlen);
 			if (!ipv6_addr_equal(&prefix, &ip6rd.prefix))
 				goto done;
-			relay_prefix = ip6rd.relay_prefix &
-				       htonl(0xffffffffUL <<
-					     (32 - ip6rd.relay_prefixlen));
+			if (ip6rd.relay_prefixlen)
+				relay_prefix = ip6rd.relay_prefix &
+					       htonl(0xffffffffUL <<
+						     (32 - ip6rd.relay_prefixlen));
+			else
+				relay_prefix = 0;
 			if (relay_prefix != ip6rd.relay_prefix)
 				goto done;